Improvement in windows for stoves



having slips of mica inserted.

tnted ,tat/es @anni milite.

Letters Patent No. 111,020, dateasspuary 17,1871.

- IMPROVEMENT IN WINDOWS FOR S'I'QVVES.

`'The Schedule reierredto i.n these Letter-s Patent and making partV of the sanne.

To whom' fit may concern ,f

Be it known that I, HENRY .BVAN BENTHUYSEN, of Lock Haven, in the county of' Clinton and -State of Pennsylvania, have invented certain Improvements in Mi'ca'llluminat-,ors for Stoves, oil which the following is a specification. j

It is an established custom very generally observed lin the construction of stoves, toform window-openings iu the external `casing for the insertion of Vsli ps of mica, in order that the rays of light from the fire may Ipassvout to the surrounding objects, making the` tire visible'to the eyeyand rendering the stove' more cheerful. So agreeable and popular has this 'custom become'that it would be presnmptuous in the inventor of a new stove to expect his Astove to be received withitvoig'however much merit it might have in other respects, il' it were .impossible for himto give it a respectable illumination by means of mica doors or windows. i V

The nature and object vof my invention is to illuminate and -beautify my Gontinental 7 base-burning stoves for bituminous oranthracite coal; to preserve and keep clean the slips of mica, and prevent the deposit of soot or fine ashes thereon when kindling lire, or during the combustion of soft or hardcoal, so that the rays ot light and heatmaynotbe intercepted `by thensual d iscoloration'ot the micas, and so as to require but little attention to keep them in fine conditionf. l v

My invention is `applicable to all stovesin whicha fine illuminatoris desirable.

Figurel is a' front elevation of a stove-doorframe `Figure 2 is a central crosssection of said door. Figure 3 is a front elevation ot'a wimlow-frame, having mieainserted.

Figure 4 is a central cross-section-oi'v said window. Figure 5 is au external edge view of .a window or door. A A are the external frames of door and window.'

IS is theintern'al frame, clamp, or mica-holder of the doei', which answers for a deection-plate 'to turn the air. h-

B2 is the deflee'tionfplatc of the 'window for direct'- ing the air across the inner surface of the mica. bis the clamp or mica-holder of the window the mica-holder being held firmly between this andthe external frame.

U C -arethe conical points on the door-frames, between;v .which thc lslips'ot mica are vimpnged vand held in place, shownpartlyby the dotted lines,

D-Dare aix-#spaces :or chambers, to admit .a free passagetof air around the edge of 'the mica.

E E are mica lights.

F F are'pcrforations in the front or edge of window-frame, or edge of door-frame.

O is a broken portion of the external casing of Ya stove.

The discoloration of' themica is prevented and the mica preserved by a'thiu sheet, cushion, or current of air, which, to lbe effective, must be in proper quantity,

uninterrupted, and not-intercepted by any-bearings,`

and directed across the internal surface of the mica.

When a fire is ignited in a stove. an upward current-is started, and air is drawn in to fill the partial vacuum.' A-This factis taken advantage of' in the construction ot my mica doors and window-s.

Air is admitted from the exterior of the stove and deected in the direction of the arrows, across the inner face of the mica, meeting witlkno other obstruction in its passage than the small conical points, which do not intercept or materially divide the'sheet of `air across the door-micas; and with the window the action is still more perfect, -as the air is spread and delected in an entire sheet, therebeingno interruption in its passage from the air-chamber.

Whenever a bearing of any size larger than a mere t point is placed so as lo intercept or break-the sheet ot' air near where it strikes the inner surface of thc mica, the mica will invariably become discolored, 4sooner or latex-,"directly inside of such bearingdepending 'fon the distance of the mica from 'th'e lire.

` Micasinserted with my'device may be placed close to or at any reasonable distance from'the ire, and remain clean for'a length of time in spite of the intense smoke arising from a newly-lighted ir'e of bituminous coal; and with anthracite coal they will remain clean an indefinite period.

The arrangement, as set forth in figs. 3 and 4, is complete and successful in vits operation as appliedto a single or double mica of reasonable width; but, when three 'or more micas are arranged side by side, as shown in l'ig. 1, adiiererit devicebecomes necessary in order to protect the central micas. The conical points and air-,space answer this purpose. and operate well alone; but I prefer combining the two devices on alarge door by notching out or perforating the edge of the door, and Vsurrounding the opening for the door. with a deflection-plate like B2, in order to insure the desired action against all defects; hence the necessity of hating two' distinct devices `to render theilluminator as nearly perfect as possible. Either device will answer thepurpose alone, but the one devisedfor the windows .is the. best. forr windows, and

that devised for doors, though-good alone, is better when combined with theformer. i i

.l do not limit myself to any particular A shape or size of lopenings for mica lights; nor to :any particnlar number. ot conical points around such openings; nor to any particular, shape, size, number, or location of the perfoiations for the admission of air to the airchamber; nor, indce, to any particular manner of lpartof a mica. frame, for holding the' mica inplace,

or their equivalent, substantially asset forth.

2. The air-spacc or chamber D, for the. passage of air around the cdgefof the mica, substantially as dcscribed. Y

3. The deiiection-platc B2, attachcd'to or cast solidlwith the casing (1r-frame, substantially as 'and for the purpose described.

4. The perforations or air-passages F F, or equivalents. and thc same in combination with` the airhereinbefore described.

substantially as shown in figs.'1 and-.2, in combination with deflection-plate Bair-passages F F, and air chamber D, as and for the purposes described.

6. A micav frame, (door or window) 'constructed substantially as vshown vin figs. 3 and`4, in combination for thc purposes set forth.

` B. VAN BENTHUYSEN.

Witnesses:

R. H. BOGGIS, GEo..D. BowMAN.

chamber D, substantially as and for thepurposcs' 5. A mica frame, (door or window) constructed wit-l1 deflection-plate B2 and air-chamber D, as and 

